Description / Abstract:

The messaging between the Transportation Management Center and
field devices is accomplished by using the NTCIP Application Layer
services to convey requests to access or modify values stored in a
given device; these values are referred to as objects. NTCIP 1201
v03 identifies and defines object definitions that may be supported
by multiple device types (e.g., actuated signal controllers and
dynamic message signs). In the NTCIP family of standards, objects
for a given device type are grouped in a device-type-specific data
dictionary standard.